If you see my New People Questions thread, I’ve linked to a good IME (how to type in Japanese) tutorial there. Also there is both a resource thread here in this section, and another thread with good things called “What do I do now?” in the Campfire section.
You can try searching around the forums too, we’ve left all kinds of tips everywhere.
I’m pretty tired after a really long day at work (and posting from my phone) otherwise I might re-link you some stuff. But all of the topics I mentioned are pinned to the top of the respective forum sections.
Your question was pretty expansive (and therefore vague), so other than that I can say: learn your katakana soon (it’ll start showing up in WK in a few levels), start grammar ASAP if you’re serious about the language, and rfindley’s Timeline userscript (for WK specifically) is suuuper helpful.